1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27277b3e9b8cc839657fa7c22d11fd07718e1c3bf361ab0cc0135c2eea711aff. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7f2c4666-c564-4cc7-966a-1f5ba05f6769.json and https://artists.proofprofile.net/proofs/artist/7f2c4666-c564-4cc7-966a-1f5ba05f6769.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb8cf04c981991a2794bf9fa360c2ec2d9449cbd1244423995fbae2b92e76374. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZK6K2464673.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabd88aa229bd96362d8be41744eb894dc7844b89d3df70124e67ba82ca23d655. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QT2VB2430908.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbc9ff7449040d41f63e2451e1753e3e262b7d909a0439faf1e76fc2d4e90728. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QT2VB2430909.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x708959e515c4cd33391d2b6a22dd6c35f9a3e19629cb3b75e20def5683a032b5. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QT2VB2430910.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a3e459cc2b6fef217e32e3b7dc74f4fef8fda18433c1579509a1b41ea86ac65. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QT2VB2430912.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f4031e375ccbf22949b79548e3ec720fd21ee354478e07aa2f02cef86627be6. Chain 2 (Bitcoin): anchored in block 957833 (2026-07-13T09:36:32Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZPEW2577983.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43861b2c452cfe79d16cc8652534fc058626d344522b892070691aa286845aa9. Chain 2 (Bitcoin): anchored in block 958325 (2026-07-16T21:10:13Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZPEW2577984.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52abfc4378705f8d8b3ed6a748dc1d95677325c598856562a5b5100263e58627. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZPEW2577985.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc642d9c83caef9b4f7ebe6d9023ac177b0c4fc1e67ad26b674c0e43afdac85e. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZPEW2577986.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a7e8f0e0f5c4e56a8b8a43619195d2450030a100e1fc1e5141e07a5317f2f57. Chain 2 (Bitcoin): anchored in block 957898 (2026-07-13T19:28:48Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZPEW2577988.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cb0f51c01ae61aa247ce700232127cb9be48b2edd87f139c0d27072f796b08f. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZPEW2577987.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdd44bd6d94917f6763ea4e69f726926310dd415849e0f798a45bc9ed01ad4e4. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QT2VB2430911.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfaa69fcf65c86ae4b058f4acefd19e7fea67edeca2d182703f6f565964de8ea. Chain 2 (Bitcoin): anchored in block 958842 (2026-07-20T07:48:27Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QMDA72414726.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfaa69fcf65c86ae4b058f4acefd19e7fea67edeca2d182703f6f565964de8ea. Chain 2 (Bitcoin): anchored in block 958582 (2026-07-18T16:47:25Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QMDA72414726.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe980f04f7a9b7aff699d7c709c28e7d12e7e7cc763104733dab571d4b73498fd. Chain 2 (Bitcoin): anchored in block 958104 (2026-07-15T05:34:05Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QT4K32512947.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe03dc63b1cf91e23c5f3e2d1ec21c5fe8d21aa15c6d30bf4a20bd0a240c373c8. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QT4K32563867.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35b201af90287a150b84ccd23f54951da90f242caf2fb4be730f80441fabd7ef. Chain 2 (Bitcoin): anchored in block 958633 (2026-07-19T00:54:50Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QT4K32563868.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a5930d0f6d2ca6acabb90d754f32ab1a7ef65cda92db4d61444916f58523ffb. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QT4K52502094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34d0c5bc53290a6a58c0697dc4dab9cbe3a14d283a3bfbafc1d306d243a7a8ec. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZS672583941.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38d4bb9882dd075be06fecc574e1751bc34d9c5c11852d52978f829eef96fe81. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QMFMF2509589.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x361b5aa94cfd76faa064730e383cde37f2145dbad1dccb15b192ce6dbc2df5cf. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZWFS2429660.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84282ffe07311154540f3d02b79544506ba7e8d262d6f4627d5ca10e20b9911f. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZWFH2478273.